Wolfgang Wieser wrote:
> I am not completely sure about what I am talking here but at least 
> what I propose in the following lines removed black spots on the isosurface 
> of my Mars renderings. (These spots only occur when the light comes under 
> a flat angle and when no_shadow is NOT set.)
> 
> [...]

What you describe seems to be specific to shadow rays, does your 
suggested change also influence the appearance of the actual surface 
(i.e. camera rays). You could try rendering with a fairly large accuracy 
value for testing.

I agree with Thorsten that the interpolation will probably cause 
slowdown without much advantage (and i don't think the simple version 
you posted will work correctly in all situations).  Also note we are 
talking about differences of a maximum of accuracy*0.5.

Christoph

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